Add hints for printing colored labels

[KevinMitchell]

A very useful tool. But for inexperienced users, such as myself, it would be useful if the readme included some details of how to print these labels in color, e.g. in BambuStudio. Probably obvious to most users, but a few sentences to help the rest would be useful

[rafaelfiviola]

It's kind of already there in the readme... Plus I personally don't think it should be this repo's responsibility to teach you how to print stuff in Bambu Studio with so much content over there explaining the process in detail.

I do agree however that there could be a "coloring" section pointing to this section. But the info's there.